Method for concrete piling



Feb. 10, 1931.- s. rAKl-:cHl

METHOD FOR CONCRETE FILING Filed Feb. 20. 1928 YParental Feb. 1o, 1931PATENT oFFlcE- YSHOJ'IRO TAKECHI, 0F OSAKA, JAPAN METHOD FOR CONCRETEFILING- Applicaton led February 20,1928, Serial No. 255,731, and in J'apan- VMarch 19, 1927.

This invention relates to a method for concrete piling and has for itsobject towobtain great stability and supporting ability of theindividual piles while avoiding the expense of piles of uniform orsubstantially uniform large diameter or cross-sectional dimensions.

In the accompanying drawing:

Figure 1 represents a vertical section illustrating in elevation a pileas driven into the ground with the filling material shown incross-section; and

Figure 2, a view similar to Figure 1 of a pile being packed or filledaccording to my method.

Referring to the drawings, 2 designates a preferably concrete pilehaving a plurality of uniform size preferably equidistantly verticallyspaced annular enlargements 3 each formed with a tapering lower face orshoulder to facilitate the driving of the pile, and with an upper facepreferably extending at right angles to the axis of the pile to serve asa supporting face or shoulder for the packs or lls 1 of sand and/0rgravel 7. In the practice of my method a preferably fimnel shapedVhopper 6, with an open bottom, is disposed on the ground surface 5 andthe pile 2 is driven down through the hopper 6 until the lowest annularenlargement 3 has passed through said open bottom of said hopper, theopening in which is just large enough to allow the passage of theannular shoulders 3. When the pile 2 has been driven into the ground tothe degree stated, and preferably before the upper supporting face orshoulder of the lowest annular enlargementV 3 passes below, orappreciably below, the bottom of the hopper 6, the latter is filled withsand and/or gravel and is kept full continuously thereafter until thepile has been completely driven in. The sand and gravel 7, being fluentmaterial,

will flow under the action of gravity downv through the bottom of thehopper 6 about the pile 2 between the enlargements 3, and the jarringaction of the hammer 8 in driving the pile 2 will serve to aid inmaintaining the flow of such sand and/or gravel' 7 and to pack the sameabout the pile 2 and as supported by the top or supporting face ordriven into the ground and the wall of said shoulder of the said lowestannular enlargement 3 into a pack or fill 1 until the second lowestannular enlargement passes into the open bottom of the hopper 6 andcloses the same against the passage of sand and/or gravel 7therethroughuntil said second lowest annular enlargement 3 has moveddownward until'its upper supporting face or y shoulder is belowvthebottom of the hopper 6, when the above action will be repeated, and soon until the driving of the pile 2 has been completed.

In this way the portions intervening be tween the annular enlargements 3are filled in with solid well packed fills or packs 1 of a nature tocontact with the opposed face of the bore l formed by the driving of thepile 2 with its annular enlargements 3, and said packs Aor fills 1together with the annular enlargements 3 serve to maintain efhcientfrictional supporting contact with the opposed face of the bore 4through pile 2.

Claim:

The method of driving and packingk piling comprising the employment of apile having a plurality of spaced annular en-v largements of uniformcross-sectional size and shape, each said enlargement hav-ing a taperinglower face and an upper annular face forming a supporting shoulder forfilling material, driving said pile at a substantially uniform rate oftravel by percussive means, arranging a supply of fluent solid fillingmaterial such as gravel closely about said pile, whereby the fillingmaterial will fiow down the hole bored by the pile as one of saidenlargements moves downward below the top of said hole, filling thespace above said enlargement and between said pile and hole, until thesucceeding enlargement temporarily closes the top of said hole, thevibration set up by the percussive driving means serving to promote theflow of filling material and tending to pack it between said wall andsaid pile.

In testimony whereof, I have signed my name to this specification.

' sHoJinoTAKnom. 'i

the length of the Y

